There is a solitary, intramuscular, soft tissue mass within the posterosuperior lateral gastrocnemius muscle measuring 46.9 x 14.2 x 15.9 mm. There is irregular adipose tissue with an eccentric central, apparent cystic component measuring 13.7 x 12.7 x 16.4 mm, with low T1 and high T2 and high Stir signal intensity.
There is a homogenous enhancement of the central component post-contrast administration.
The irregular circumferential adipose components remain non-enhancing.
The sonographically identified punctate calcifications are poorly appreciated.
No perilesional edema or subcutaneous infiltration.
There is no bone infiltration, and no other lesions are identified.